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Phase Duration Dosage Dose-escalation Single day 5 levels: 0.5, 1, 1.5, 3, and 6 mg; increasing doses every 20–30 minutes Up-dosing Months 11 levels: 3, 6, 12, 20, 40, 80, 120, 160, 200, 240, and 300 mg daily; increasing doses at visits every 2 weeks Maintenance Months to years 300 mg daily Adapted from information in reference 15.